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Heinrich Hertz detects and produces radio waves.
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Marchese Guglielmo Marconi builds his first radio equipment, a device that will ring a bell from 30 ft. away.
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American scientist R.A. Fessenden transmists human speech via radiowaves.
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Marconi transmits telegraphic radio messages from Cornwall to Newfoundland
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Valdemar Poulsen patents an arc transmission that generates continuous radio waves, producing a frequency of 100 kHz and receivable over 150 miles.
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First radio transmission of music at Graz, Austria.
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Edwin Armstrong patents a radio receiver circuit with positive feedback. Part of the amplified high-frequency signal is fed back to the tuning circuit to enhance selectivity and sensitivity.
